Sintering apparatus.



No. 891,327. Y PATENTBD JUNE 23, 1908. E. B. CLARK & C. H. PETTEL.

SINTERING APPARATUS.

APPLICATION FILED MAR. so. 1908.

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'UNITED sTATEs PATENT oEEroE.

EUGENE B. CLARK, OF CHICAGO, ILLINOIS, AND CHARLES H. FETTL, HUBBARD, OHIO,

ASSIGNORS TO AMERICAN SINTERING COMPANY, OF CHICAGO, ILLINOIS, A CORPORA- TION OF ILLINOIS.

' SINTERING APPARATUS.

Specification of Letters Patent.

Patented June 23, v1908.

Application led March 30, `1908. Serial No. 424,207.

To all 'whom it may concern:

Be it known that we, EUGENE-B. CLARK and CHARLES H. FETTEL, citizens lof the United States, and residing at Chicago, in the county of Cook and State of Illinois, and at Hubbard, in thecounty of Trumbull and State of Ohio, respectively, have invented certain ynew and useful AIm rovements in Sintering Apparatus, of whic the following is a specification, reference being had tothe accompanying drawings.

Our invention relates to apparatus for sintering various materials, such as iron ores, and has for its object to provide certain improvements in such apparatus by which certain objections incident to the apparatus heretofore employed may be avoided, as will hereinafter appear.

One of the principal forms of apparatus heretofore employed for sintering consists of a rotary kiln through'whichthe material is passed from end to end, the kiln bein set in an inclined position and the materia being fed into its upper end and passing out of its Alower end, the kiln being meanwhile rotated and the material being subjected to a high resulting in the agglomeration of t e particles into small masses suitable for use in manufacturing steel. An apparatus of this character is illustrated and described in the application of Eugene B. Clark, Serial No. 401,713, filed November 1 1, 1907.

The materials treated differ in their qualities or characteristics, most of such materials bein basic in character while others are acid.

, The igh temperature employed in the sinterial.

tering process makes necessary the use of a lining of refractory material in the kiln, and prior to our invention it has been the practice to line the kiln with brick or similar ma- This, however, is objectionable for the 'reason that while a large part of the materials treated-such, for example, as iron oxids-are basic incharacter, it is sometimes necessary or desirable to treat acid material. The temperature reached in the process of sintering is high enough so that asic materials would react upon an acid lining, and acid materials would react upon a basic lining, and therefore a kiln cannot be changed from basic materials to acid materials without relining, which is costly and involves serious delay. Furthermore, most brick, and furthermore is very unsatisfactory l by reason of its great sensitiveness to temperature changes, as such bricks disintegrate rapidly and are therefore unsuited for use in a process such' as that of sintering which necessitates more or less frequent and severe changes in temperature.

It 1s, of course," essential that the shell or casing of the kiln be protected a ainst the` extreme heat to which the materia s are subjected in the kiln, and also that loss of heat by radiation should be guarded against; and to provide a lining which will meet all the requirements of the situation is the object of our resent invention.

We ave discovered that the objections to the devices heretofore employed may be avoided and the desired advantages may be secured by employing a linin of'cast-iron. The cast-iron lining is in the form of plates which fit to ether to form a tubular shell between whic 1 and the kiln casing or shell is' packed suitable non-conducting and heatresistin material, such-as fire clay or ganister. he cast-iron plates are made in sections and are secured together so thatwhen the lining is completely installed it forms practically a continuous tube which is iixedly supported Within the kiln proper. Suitable standards or supports are provided in the form of flanges, which bear against the inner face of the kiln shell and aid in preventing` displacement ofthe lining.

' Intheaccom anying drawings,which illustrate a kiln em odying our improvements,-

Figure 1 is a side elevation of a sintering apparatus similar in general to the apparatus describedfin the said Clark a plicat-ion herey inbefore referred to, parto the kiln being broken away to show the interior thereof; Fig. 2-is a cross-section on line 2-2 of Fig. 1 Fig. 3 is a detail, 'being a partial longitudinal section on linel 3-3 of Fig. 2; and Fig. 4 is a perspective view of one of the lining plates. Referring to the drawings-5 indicates the 'kiln proper, which is in the form of a cylinder mounted on rollers6--7 and driven by a pinion 8 engaging an annular rack 9 carried by the kiln. .'The kiln is inclined, as shown in Fig. 1, receiving its charge through a chute 10, or other suitable feeding means, at its upper end which connects wlth a stack 11.

12 indicates an endless chain, which moves through the kiln from end to end and is provided with scrapers 13 which act to scra e the i'nner surface ofl the kiln to loosen u t e material which adheres thereto. It W1ll be understood that the interior of the kiln is heated to the requisite temperature by suitand for rotating the kiln, as Well as the means.

for supplying heat for the kiln, form no part of our invention and may be of any approved form.

18 indicates one of the lining plates, which, as best shown in Fig. 4, are curved plates having at their straight margins flanges 19-20 4which are radialljT disposed so that when the several sections are fitted together the flanges 19-20 of any plate will register with the corresponding flanges of the adjoining plate.

Preferably each of the plates 18 subtendsan arc of one hundred and twenty degrees, so that three of such plates together form a complete ring. The several plates also fit together at their ends Aor curved edges where they are provided with lugs 21 for joining the adjoining plates, bolts 22 referably being employed to connect the fiigs of adjacent plates, as shown in Figs. 2 and 3. It will be noted that the lining 18 is somewhat smaller in diameter than the shell of the kiln 5, and the width of the fianges 19-20 is equal to the difference between the external diameter of the lining and the internal diameter of the shell of the kiln, as shown in Fig. 2. The lining plates are made of cast-iron, which not only adequately resists the heat of the kiln and the chemical action of the materials treated, but also the wear occasioned by the movement of the Scrapers through the kiln, and, moreover, a lining constructed as described may be used with much less expense than the materials heretofore used.

23 indicates a non-conducting and heatresisting material with which the space between the lining and the shell of the kiln is filled, as shown in the drawings. Such filler may be fire clay, or any other suitable material, which maybe rammed between the segments of the lining and the kiln casing.

24 indicates supports placed intermediately between the flanges 19-20 of any segment to support the intermediate portion thereof in substantially the same manner as the flanges 19-20 support the end portions of the lining plates. Said supports 24 are disconnected from the segmental lining plates so that they are not affected by the expansion or contraction of said plates.

So far as we are aware, no one has heretofore employed a cast-iron lining in a sintering kiln, or such a lining formed of segmental plates fitted together but disconnected from the shell of the kiln. N or has it heretofore been proposed, so far as we are aware, to employ a cast-iron lining in connection with non-conducting material se arating such lining from the casing of the ki n, and the claims hereinafter made are therefore to be construed accordingly.

That which We claim as our invention, and desire to secure by Letters Patent, is,-

1. A sintering a paratus, comprising a rotary cylindrical kfln having a cast-iron linmg.

2. A sintering a paratus, comprising a rotary L.cylindrical kn having a' cast-iron lining, in combination with scraping means operating in said kihi for scraping off the material adhering to the lining.

3. A sintering ap aratus, comprising a rotary cylindrical kiln avinga lining composed of segmental cast-iron plates fitted in the kiln but disconnected therefrom.

4. A sintering a'p aratus, com rising a rotary cylindrical kill having a ining comosed of segmental cast-iron lates fitted in the kiln but disconnected t erefrom, said plates being connected together to form a` continuous cylinder.

5. A sinterin a aratus, com rising a ro- `tary cylindrica k n having a ining comosed of segmental cast-iron lates fitted in the kiln but disconnected t erefrom, said plates being connected together to form a continuous cylinder, said pzlates'having supports which engage the inner Wall of the kiln.

6. A sintering ap aratus, com rising a rotary cylindrical k1 n having a ining composed of segmental cast-iron lates fitted-in the kiln but disconnected t erefrom, said plates being connected together to form a continuous cylinder, said plates having radial flanges which engage the inner wall of the kiln and support said plates therein.

7. A sintering a paratus, com rising a rotary cylindrical ki n, a cast-iron ining therein, and a non-conducting filler between said lining and the kiln shell.

8. A sintering a paratus, com rising a rotary cylindrical ki n,a cast-iron ining therein, and a non-conducting filler between said lining and the kiln shell, saidlining being disconnected from the kiln.

9. A sintering a paratus, com rising a rotary cylindrical ki a cast-iron lining therein, and a non-conducting filler between said lining and the kiln shell, said lining being disconnected from the kiln and having sup orts Which bear against the inner wall of the `ln.

10. A sint'ering apparatus, comprising a rotary cylindrical shell having a lining composed of segmental cast-irondplates having radial iianges, the flanges of a joining plates being secured together.

11. A sintering ap aratus,` comprising a rotary cylindrical Shelli) havinga lining composed of segmental cast-iron plates having radial iianges, the anges of adjoining plates Abeing secured together, and a non-conducting iiller between the lining and the shell.

'12 A sintering apparatus, comprising a rotary cylindrical shell having a lining com- 1'5 posed of segmental cast-iron plates having radial flanges and lugs for securing adjoining plates together to form a continuous tube.

EUGENE B. CLARK. CHARLES H. FETTEL.

Witnesses to signature of Eugene B.

Clark:

O. M. HULsE, M. A. BAssErT. j Witnesses of Charles H. Fettels signature:

W. S. BOND, L. L. CAMPBELL. 

